Manufacture of artificial viscose silk



UNITED STATES PATENT OFFICE.

EMILE BRONNER'I', or mumrousn, Alsace-LORRAINE, Eamon.

MANUFACTURE OF ARTIFICIAL VISCOSE 8111K.

1T0 Drawing.

To all whom it may concern:

Be it known that I, EMILE BRoNNnnT, a

' citizen of the Republic of France, residing the spinning bath, it ispreferable and more at 1 Quai du Barrage, Mulhouse, Alsace- Lorraine,France, have invented certain new and useful Improvements in. theManufacture of Artificial Viscose Silk, of which the following is aspecification.

A process for spinning very. fine threads from viscose solutions hasbeen proposed, in which spinning baths containing aldehyde bisulfites orthe reduction products thereof, ketone bisulfites or solublecondensation products of phenols with aldehydes and sodium-sulfitesareemployed.

Now it has been found that instead of adding these water solublecombinations to economical to add the various condensation products ofphenols and aldehydes soluble in alkali, to the viscose itself,preferably prior-to the ripening process, and to force the suitablyripened mixture into bisulfitebaths for example. 25

Example.

10 kg. artificial resin produced from phenol and formaldehyde aredissolved in about 3.6 kg. caustic soda and 43 kg. water and-then 1000kg. freshly prepared raw viscoseare added.

A homogeneousmixture of the above constituents is subjected to the usualri ening and then worked up into threads in the usual manner, use beingmade of a warm concentrated bisulfite bath. The feed of material is atthe same time regulated to correspond to the desired fineness of thesingle threads and to the corresponding necessary drawing ofl' speed.Apertures say of 0.10 mm. can be used, but also finer or larger onesrnaybe employed, in taking in consideration the chosen viscosity of theviscose. i

The concentration of the spinning baths must be the greater the finerthe titre of the thread is desired. For ordinary threads ofSpecification of Letters Patent. Application filed September a, 1920.Serial No. 468,967.

filed August 31, 1920.

Patented Apr. 12, 1921.

' same dyes or coloring materials-darker than the products obtained fromraw viscose and without addition of other materials. A pos sibleexplanation is that the residue of the products precipitated out by theacid act as a mordant. Also theresistance to water is somewhat higherthan with viscose threads spun from viscose alone without the additionsin question.

. The broad idea of precipitating viscose in bisulfite baths, theconcentration of "which isjnversely proportional to the thread finenesstobe produced, is not herein claimed, as said matter is claimed broadlin my copending application, Serial I claim:

The process of producing artificial viscose silk threads up to 1 denierin fineness, consisting in that raw viscose with alkaline condensationproducts of phenols and aldehydes [are spun in bisulfite baths,theconcentration of the baths being inversely proportional to thethreadfineness to be produced.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses. l

EMILE BRONNERT.

Witnesses:

L. B. DE SALIS, -N. SGI-ILUNNBERG.

